JP3362019B2 - Earth retaining wall and RC composite structure - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the construction of a main body structure of a reinforced concrete structure inside a soil retaining wall having a steel core material, in which the steel material of the core material of the soil retaining wall and the outer peripheral wall of the main body of the reinforced concrete structure are formed. This relates to earth retaining walls and RC composite structures that are integrated through a dowel, and is applied to underground parts of buildings or underground structures such as tunnels and underground parking lots.

[0002]

2. Description of the Related Art In the construction of a conventional earth retaining wall / RC wall composite structure, an underground continuous wall as an earth retaining wall having H-shaped steel as a core material is constructed and surrounded by the underground continuous wall. Alternatively, after excavating the underground part of the structure to be sandwiched or the underground structure part, wash the inner surface of the earth retaining wall, and attach the stud dowel etc. to the flange of the H-section steel etc. which is the core material by field welding. There is. After that, the side wall of the main body and the floor slab of the main body are laid out, and the concrete retaining wall is integrated with the earth retaining wall and the main body wall of the RC structure through the above-mentioned stud dowel to form a composite structure. There is.

Further, Japanese Patent Application Laid-Open No. 7-48846 discloses that
In order to solve the problem of welding the stud dowel in the field and the problem of construction when the stud dowel is welded at the factory beforehand, short threaded bolts are welded at the factory in advance to the core material of the earth retaining wall. In advance, cover the threaded bolt with a protective cap and build it in the ground, after excavating the inside of the earth retaining wall, remove the protective cap and join the threaded connector with the above threaded bolt with a coupler, A method of constructing a synthetic basement wall for use is disclosed.

[0004]

[Problems to be Solved by the Invention] Conventional retaining wall / RC
In the general construction method of wall composite structures, it is possible to build the core material by welding the stud dowel to the core material in a state that it is deformed or damaged during installation. There is a risk of doing it. Further, even when excavating the inner surface side after the construction, it is difficult in terms of work to excavate and clean the portion where a large number of stud dowels project without deforming or damaging the stud dowels.

Further, in the method described in Japanese Patent Laid-Open No. 7-48846, although the above-mentioned problems are solved, a protective cap is attached and detached, and a large number of threaded connectors and threaded bolts by couplers are used in the field. A lot of labor is required for joining, etc., and it does not necessarily lead to the improvement of work efficiency on site. The invention of the present application is intended to solve the problems in the conventional technology as described above, and by the perforated steel plate dowel attached to the core material of the earth retaining wall in advance, it is possible to greatly simplify the site work, and It is intended to provide an earth retaining wall / RC composite structure that is also excellent in unity by Gibel.

[0006]

The earth retaining wall / RC composite structure according to claim 1 of the present application has a steel material which is a core material of the earth retaining wall, which has been constructed in advance, and an inside of the earth retaining wall. In an earth retaining wall / RC composite structure in which a main body outer peripheral wall of a constructed reinforced concrete structure is integrated through a dowel protruding to an inner surface of the earth retaining wall of the steel material, in a longitudinal direction of a strip-shaped steel plate as the gibbel. Characterized in that a perforated steel plate dowel formed by forming a plurality of holes in the steel material is projected inside the earth retaining wall of the steel material and joined along the longitudinal direction of the steel material, and is embedded in the concrete of the outer peripheral wall of the main body. It is what

As a steel material for the core material of the earth retaining wall, an H-section steel is generally used, but it is not limited to the H-section steel, and a steel material having an arbitrary cross section can be used. Generally, the perforated steel plate dowel may be provided in the section of the main body wall of the reinforced concrete structure constructed inside, and there are a case where a large number of short ones are attached and a case where one or a few long ones are attached. Conceivable. Further, when the core material is an H-shaped steel, it may be possible to provide one row or a plurality of rows on the flange of the H-shaped steel. Joining of a perforated steel plate dowel to a steel material is usually performed by welding in a factory, which is advantageous in terms of quality control.

According to the present invention, since the core material of the earth retaining wall can be built in the state where the perforated steel plate dowel is joined in advance, the work on the site is small and the construction is easy. In addition, the perforated steel plate dowel is attached in the longitudinal direction of the core material, and it has a cross-sectional rigidity that is higher than that of conventional stud bolts and round steel against the vertical resistance from the ground when installing the core material. Since a much larger bearing resistance can be obtained from the aspect of, there is no fear of deformation or damage. Furthermore, since it has greater cross-sectional rigidity than the perforated steel plate dowel itself, stud bolts, etc., it is also excellent in terms of fatigue characteristics.

A second aspect is the earth retaining wall / R according to the first aspect.
In the C composite structure, in the hole of the perforated steel plate dowel,
This is the case when there are rebars or horizontal rebars to increase the integrity of the outer peripheral wall of the main body with the concrete. That is, by utilizing the holes of the perforated steel plate dowel and passing the reinforcing bars or horizontal reinforcing bars through the holes, the integrity with concrete can be further enhanced. It is also possible to use this hole for positioning and holding the outer peripheral wall of the main body of the reinforced concrete structure and the reinforcement of the main body slab.

The arrangement of horizontal reinforcing bars is facilitated by partially cutting out the holes of the perforated steel plate dowel. According to a third aspect of the present invention, in the earth retaining wall / RC composite structure according to the first or second aspect, at the joint position between the outer peripheral wall of the main body and the main body slab of the reinforced concrete structure, the rebar end portion of the main body slab is the soil. Bend by extending it to the vicinity of steel, which is the core material of the retaining wall, and fold this bent portion between the reinforcing bar or horizontal rebar inserted through the hole of the perforated steel plate dowel and the surface of the steel material. This is the case when they are restrained and fixed.

The joint portion between the outer peripheral wall of the main body and the main floor slab (including the bottom slab and the top slab) is an important point in terms of the strength of the structure. The reinforcing bars of the floor slab are extended and the corner punches are provided. Reinforcement is made by arranging a haunch reinforcement bar in the part. In the conventional structure, a jig is attached to a steel material serving as a core material of the earth retaining wall, and the reinforcing bar of the floor slab extended to the jig is fixed. However, in the invention according to claim 3, The structure is such that fixing is carried out by using the reinforcing bar or horizontal reinforcing bar that passes through the hole of the perforated steel plate dowel, which saves the trouble of attaching the jig.

Further, in the conventional structure, when the fixing jig is attached to the core material in advance, the fixing may be difficult due to construction restrictions such as the core material staying high.
In the present invention, since any hole of the perforated steel plate dowel can be used, there are few such restrictions. It should be noted that the constraint in the sandwiched form does not necessarily need to be in close contact with each other, and it is sufficient to be restrained through concrete.

According to a fourth aspect of the present invention, in the earth retaining wall / RC composite structure according to the second or third aspect, the hole of the perforated steel plate dowel is provided with a notch opening to the outer peripheral wall side of the main body, The horizontal reinforcing bars can be inserted through the notches. Particularly in the case of a horizontal reinforcing bar, it is difficult or impossible to pass through the hole of a perforated steel plate dowel because it is a part of the bar arrangement of the outer peripheral wall of the main body. In such a case, as described in claim 4, by providing the hole with a notch that opens to the outer peripheral wall side of the main body, the reinforcing bar or the horizontal reinforcing bar can be fitted from the side, which facilitates field work. Become.

According to a fifth aspect of the present invention, in the earth retaining wall / RC composite structure according to the first or second aspect, regarding the joint position between the outer peripheral wall of the main body and the main body floor slab of the reinforced concrete structure, the reinforcing bar end portion of the main body floor slab is connected. And extend it to near the steel material that is the core material of the earth retaining wall, and bend this bent portion to the hole of the perforated steel plate dowel through a spacer or a stopper or a horizontal reinforcing bar and the steel material. It is fixed and fixed by being sandwiched between it and the surface of.

The basic concept is the same as that of claim 3, but when the rebar of the main body floor slab has a large diameter, the rebar or horizontal rebar and the earth retaining wall inserted into the hole of the perforated steel plate dowel. It is conceivable that there is not enough space between the core material and the surface of the steel material to insert the bent portion of the reinforcing bar of the main body floor slab. In that case, instead of directly inserting a reinforcing bar or the like into the hole of the perforated steel plate dowel as in claim 5,
By inserting a spacer or a stopper and fixing the reinforcing bar through these, a space for inserting the reinforcing bar of the main body floor slab can be secured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an attached state of a perforated steel plate dowel in an embodiment of an earth retaining wall / RC composite structure according to claims 1 and 2 of the present application. In this example, two perforated steel plate dowels 2 are attached in advance to the flange 1a of the H-shaped steel 1 as the core material of the earth retaining wall on the inner side surface side of the earth retaining wall by factory welding.

The perforated steel plate dowel 2 is formed by forming holes 2a at predetermined intervals on a strip-shaped steel plate, and the concrete of the side wall 3 of the main body enters into the holes 2a so that the adhesive force (mainly mechanical adhesive force) with the concrete is increased. ) Is increasing. In addition,
The adhesive force can be further increased by using a strip-shaped steel plate as a material, such as a striped steel plate, having unevenness on the surface.

Further, the adhesive force can be further increased by passing the bar 4 through the hole 2a of the perforated steel plate dowel 2. In the figure, 5a and 5b are vertical and horizontal bars arranged in the concrete of the main body wall 3. FIG. 6 shows an example of a vertical cross section when the earth retaining wall / RC composite structure is applied to an underground tunnel for roads, and FIG.
It corresponds to the part indicated by C in the middle.

As a construction procedure, first, earth retaining walls having an H-shaped steel 1 to which the perforated steel plate dowel 2 is attached in advance as core material are constructed in the tunnel extension direction on both sides of the tunnel construction position. Next, excavation is performed between the earth retaining walls on both sides of the tunnel position, the perforated steel plate dowel 2 is exposed, and cleaning is performed. After that, the main body wall 3 is laid out, concrete is poured, and the earth retaining wall and the main body wall 3 are integrated through the perforated steel plate dowel 2.

In the figure, 10 is a ground improvement portion directly below the structure body, and 11 is an intermediate pile. FIG. 2 shows the relationship between the perforated steel plate Gibel 2 and the reinforcement of the floor slab 6 (bottom slab) in one embodiment of the earth retaining wall / RC composite structure according to claim 3 of the present application. Corresponds to the D part of.

As shown in the figure, the main bar 7 of the main body floor slab 6 is
The H-shaped steel 1 which is the core material of the earth retaining wall is extended and bent to the vicinity of the flange 1a, and the bent portion 7a is passed through the hole 2a of the perforated steel plate dowel 2 and the surface of the flange 1a. It is restrained by sandwiching it and fixed by placing concrete. In this case, the on-site work only requires inserting the insert bar 4 into the hole 2a in which the bent portion 7 of the main bar 7 is located, which makes the on-site work much easier than the conventional fixing method.

A haunch reinforcing bar 9 is arranged at the haunch portion at the joint between the body wall 3 and the body floor slab 6. Figure 3
FIG. 8 shows an example of the shape of a notch portion formed in a perforated steel plate dowel in an embodiment of the earth retaining wall / RC composite structure according to claim 4 of the present application. .

When the horizontal reinforcing bar 4a, which is a part of the reinforcing bar in the concrete, is passed through the perforated steel plate dowel 12, it is difficult to arrange the horizontal reinforcing bar 4a in the closed hole as shown in FIG. On the other hand, in the example of FIG. 3, since the hole 12a of the perforated steel plate dowel 12 is open, the horizontal reinforcing bar 4a can be inserted from the direction of the arrow in the figure. Therefore, it can be applied even when a large number of reinforcing bars are assembled in advance. The present invention can be applied not only to the case of inserting the horizontal reinforcing bar 4a but also to the case of inserting a reinforcing bar.

FIG. 4 shows the earth retaining wall according to claim 5 of the present application.
It is an example of an attachment structure of a bar in an RC composite structure. When restraining the bent portion 7a of the main bar of the floor slab as shown in FIG. 2 described above, if the main bar has a large diameter, the space between the flange surface of the H-section steel 1 and the bar may not be sufficient. is there.

On the other hand, for example, a plate 13 with a screw rod as shown in FIG. 4 (c) is fixed as a spacer to the hole 2a of the perforated steel plate dowel 2 with the nut 13c, and the hook portion of the hook-shaped bar 14 is formed. Is inserted into the hole 2a of the perforated steel plate dowel 2, and the opposite end is inserted into the hole 13b of the plate 13 with a threaded rod, so that there is sufficient space inside to accommodate the bent portion 7a of the main bar. Can be secured.

The action and effect of restraining the bent portion 7a of the main bar by using the bar 14 are the same as in the case of FIG. FIG. 5 shows another example of the attachment structure of the reinforcing bar in the earth retaining wall / RC composite structure according to claim 5 of the present application. That is, in this example, the reinforcing bar 24 is bent into a shape as shown in FIG. 5 (c), and its end is fixed to the hole 2a of the perforated steel plate dowel 2 by the bar-shaped locking bar 23, so that This is to ensure a sufficient space for accommodating the bent portion 7a of the main bar.

[0027]

The perforated steel plate dowel attached in the longitudinal direction of the core material of the earth retaining wall, when compared with the stud dowel,
Since there is little risk of deformation or damage at the time of building the core material or excavating the inside, the core material can be built in the state of being attached in advance. Also, compared to stud bolts,
It is also excellent in fatigue characteristics.

As described above, the core material can be built in a state where the perforated steel plate dowel is welded in advance in a factory or the like, so that the number of kinds of work on the site is reduced and the on-site construction is facilitated. Also, since it is installed in a factory, quality control is easy. In the invention according to claim 2, the integrity of the concrete can be further enhanced by passing the reinforcing bar or the horizontal reinforcing bar through the hole of the perforated steel plate dowel. It is also possible to use this hole for positioning and holding the outer peripheral wall of the main body of the reinforced concrete structure and the reinforcement of the main body slab.

According to a third aspect of the present invention, a reinforcing bar or a horizontal reinforcing bar in which the bent portion of the reinforcing bar end of the main body floor slab is passed through a hole of a perforated steel plate dowel and a steel material as a core material of the earth retaining wall, Since it is sandwiched between and fixed, it is possible to integrate it, including the floor slab, and it has the effect of reinforcing the main body wall and floor slab, which tend to be a problem in strength.

In the invention according to claim 4, since the reinforcing bar or the horizontal reinforcing bar can be fitted from the side, particularly for the horizontal reinforcing bar which is a part of the reinforcing bar of the outer peripheral wall of the main body, the perforated steel plate dowel is attached. Is easy to insert. In the invention according to claim 5, a wide space can be secured between the reinforcing bar or the horizontal reinforcing bar and the surface of the steel material serving as the core material of the earth retaining wall, and for example, the case where the floor slab main bar has a large diameter is dealt with. can do.

[Brief description of drawings]

FIG. 1 shows an attached state of a perforated steel plate dowel in an embodiment of an earth retaining wall / RC composite structure according to claims 1 and 2 of the present application, in which (a) is a vertical sectional view and (b) is Is a sectional view taken along line AA.

FIG. 2 shows the relationship between perforated steel plate dowels and floor slab (bottom slab) reinforcement in one embodiment of the earth retaining wall / RC composite structure according to claim 3 of the present application, where (a) is a vertical line. Cross section,
(b) is the BB sectional drawing.

FIG. 3 is a vertical cross-sectional view showing an example of the shape of a notch portion formed in a perforated steel plate dowel in the earth retaining wall / RC composite structure according to claim 4 of the present application.

FIG. 4 is a view showing an example of a structure for attaching a reinforcing bar in an earth retaining wall / RC composite structure according to claim 5 of the present application, in which (a) is a vertical sectional view and (b) is its AA cross section. Figure, (c)
[Fig. 3] is an enlarged view of the plate with full-threaded rod alone shown in (b).

FIG. 5 shows another example of the structure for attaching the reinforcing bar in the earth retaining wall / RC composite structure according to claim 5 of the present application, in which (a) is a vertical sectional view and (b) is its B- B sectional view, (c)
[Fig. 3] is an enlarged perspective view of the sole bar shown in (b).

FIG. 6 is a vertical cross-sectional view showing an application example of an earth retaining wall / RC composite structure to an underground tunnel.

[Explanation of symbols]

1 ... H-section steel, 2 ... Perforated steel plate dowel, 2a ... Hole, 3 ... Main body wall, 4 ... Reinforcing bar, 4a ... Horizontal reinforcing bar, 5a ... Vertical bar,
5b ... horizontal streak, 6 ... main body floor slab (bottom slab), 7 ... main bar, 7a ...
Bent portion, 8 ... Shear reinforcement, 9 ... Haunch reinforcement, 1
0 ... Ground improvement part, 11 ... Intermediate pile, 12 ... Perforated steel plate dowel, 12a ... Hole provided with notch, 13 ... Plate with full screw rod, 13a ... Screw part, 13b ... Hole, 13c ... Nut, 14 ... Rebar, 23 ... Retainer, 24 ... Rebar

─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hidesada Kinji 1-14-16 Minami Kohoku, Suminoe-ku, Osaka City, Osaka Prefecture Hanshin Expressway Public Corporation Osaka Construction Bureau (72) Inventor Natsuyo Sato Higashikawasaki, Chuo-ku, Kobe-shi, Hyogo Prefecture 1-3-3 Machi Kobe Harborland Center Building 22F Hanshin Expressway Public Corporation Kobe No. 2 Construction Department (72) Inventor Takehiro Nisshiki 2-19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Invention Kumiko Suda 2-191-1 Tobita-yasu, Chofu-shi, Tokyo Inside Kashima Construction Co., Ltd. (72) Inventor Kosuke Furuichi 2-19-1 Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) ) Inventor Yohei Hei 2-191-1 Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Laboratory (72) Inventor Ando 1-3-15 Awaza, Nishi-ku, Osaka-shi, Osaka Prefecture In Kansai Branch, Kashima Construction Co., Ltd. (72) Inventor Isao Saito 1-3-15, Awaza, Nishi-ku, Osaka City, Osaka Prefecture (72) Inventor, Kansai Branch Toshihiko Murata 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-6-108460 (JP, A) JP-A-5-331836 (JP, A) JP-A-11 -241340 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 29/045 E02D 5/20 102 E21D 13/00

Claims (5)

(57) [Claims] 1. A steel material, which is a core material of an earth retaining wall constructed in advance, and a main body outer peripheral wall of a reinforced concrete structure constructed inside the earth retaining wall, projecting to an inner surface of the earth retaining wall of the steel material. An earth retaining wall that is integrated through the gibel.
In the RC composite structure, a perforated steel plate dowel formed by forming a plurality of holes in the longitudinal direction of a strip-shaped steel plate as the dowel is projected inside the earth retaining wall of the steel material and joined along the longitudinal direction of the steel material. An earth retaining wall / RC composite structure characterized by being embedded in concrete of the outer peripheral wall of the main body. 2. The earth retaining wall / R according to claim 1, wherein the holes of said perforated steel plate dovetails are provided with reinforcing bars or horizontal reinforcing bars for increasing the integrity of the outer peripheral wall of the main body with concrete.
C synthetic structure. 3. The joint position between the outer peripheral wall of the main body and the main body slab of the reinforced concrete structure, the end of the rebar of the main body slab is extended and bent to near the steel material which is the core material of the earth retaining wall, and this folding is performed. The bent portion is constrained and fixed by being sandwiched between a reinforcing bar or a horizontal reinforcing bar passing through the hole of the perforated steel plate dowel and the surface of the steel material.
Or the earth retaining wall and RC composite structure described in 2. 4. The hole of the perforated steel plate dowel is provided with a notch opening to the outer peripheral wall side of the main body so that the bar or the horizontal reinforcing bar can be inserted from the notch portion.
Or the earth retaining wall / RC composite structure described in 3. 5. The joint position between the outer peripheral wall of the main body and the main body slab of the reinforced concrete structure is extended by bending the end of the reinforcing bar of the main body slab to near the steel material that is the core material of the earth retaining wall, and this folding is performed. The bent portion is constrained and fixed by being sandwiched between a reinforcing bar or a horizontal reinforcing bar attached to a hole of the perforated steel plate through a spacer or a stopper and the surface of the steel material. The earth retaining wall and RC composite structure described in 2.